uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/networking/swaks/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, perl, perlPackages, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "swaks";
+  version = "20201014.0";
+
+  src = fetchurl {
+    url = "https://www.jetmore.org/john/code/swaks/files/${pname}-${version}.tar.gz";
+    sha256 = "0c2sx4nrh4whsqzj6m5ay8d7yqan3aqgg436p8jb25bs91ykn2pv";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ perl ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv swaks $out/bin/
+
+    wrapProgram $out/bin/swaks --set PERL5LIB \
+      "${with perlPackages; makePerlPath [
+        NetSSLeay AuthenSASL NetDNS IOSocketInet6
+      ]}"
+  '';
+
+  meta = with lib; {
+    homepage = "http://www.jetmore.org/john/code/swaks/";
+    description = "A featureful, flexible, scriptable, transaction-oriented SMTP test tool";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [];
+    platforms = platforms.all;
+  };
+
+}